Ysgol Brynrefail is a bilingual comprehensive school for pupils aged 11–18.

It is situated in Llanrug in Gwynedd, north Wales.

Most of the school's pupils come from the villages of Llanrug, Bethel, Llanberis and the surrounding rural areas.

However, one or two subjects are taught to some pupils in English or in both languages.

According to the school's latest Estyn inspection report in 2020, 86% of pupils come from Welsh-speaking homes and 98% are fluent Welsh speakers.